Superfluidity of grain boundaries in solid 4He.

  title={Superfluidity of grain boundaries in solid 4He.},
  author={Lode Pollet and Massimo Boninsegni and Anatoly B. Kuklov and Nikolai V. Prokof'ev and Boris Svistunov and Matthias Troyer},
  journal={Physical review letters},
  volume={98 13},
By large-scale quantum Monte Carlo simulations we show that grain boundaries in 4He crystals are generically superfluid at low temperature, with a transition temperature of the order of approximately 0.5 K at the melting pressure; nonsuperfluid grain boundaries are found only for special orientations of the grains. We also find that close vicinity to the melting line is not a necessary condition for superfluid grain boundaries, and a grain boundary in direct contact with the superfluid liquid… Expand

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